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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd3abd93913be1ec22fef2051b01b87194e71e9df6688937653130fa8748a78dd' 
  AND token = 'BuEqNK9/r9sh5+XSI1ieUOrlFgkw15Anxz8I77khLHw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}